<template>
  <div>
    <div v-for="(item,index) in arr" style="display: inline-block" :key='index'>
    <input type="checkbox" v-model="checkNumArr" :value='item' >
    <span>{{item}}</span>
  </div>
    <p>你选中的元素, 累加的值和为: {{ theSum }}</p>
  </div>
</template>

<script>
export default {
data () {
  return {
    arr:[9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],
    checkNumArr:[]
  }
},
computed: {
  theSum(){
    return this.checkNumArr.reduce((sum,item)=>sum+=item,0)
  }
}
}
</script>

<style>

</style>